Merge pull request 'ci: filter main builds to code changes and cancel superseded runs' (#18) from ci/optimise-main-builds into main

Reviewed-on: #18

.gitea/workflows/build-and-publish.yml

@@ -1,10 +1,30 @@
 name: Build and publish container
 
 on:
+  # On merge to main, only build/release when image-affecting files change;
+  # CI-config, Renovate-config and docs changes do not produce a new image.
   push:
     branches: [main]
+    paths:
+      - 'Dockerfile'
+      - 'default.conf'
+      - 'index.html'
+      - 'styles.css'
+      - 'script.js'
+      - 'messages.js'
+      - '.dockerignore'
+  # Pull requests always run (the build is a required check); no path filter.
   pull_request:
     branches: [main]
+  workflow_dispatch:
+
+# A newer run cancels an older in-flight run in the same group (keyed by ref),
+# so a fresh merge to main supersedes the previous build and only the latest
+# release is produced, avoiding tags that would be immediately replaced. Each
+# pull request likewise supersedes only its own earlier runs.
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
 
 defaults:
   run: